I got my effort to work (kind of) - following yours...
-my reference line keeps moving?
at the moment, I'd like to keep the Maximum at 100%
and have the Parameter, move the minimum value.
Your reference line should be a constant to whatever the parameter is set to. I can't say what is happening in your case without seeing the workbook.
it seems to work better with Percentages on the Y axis
it certainly adjusts the Y Axis...
and can I now change the Y axis minimum only?
well, users comments include:
"The Control Y-axis repositions the target line and
doesn’t change the Y axis scale when greater than the minimum value in the
series. E.g. changing from .98 to .99 doesn’t change the Y axis..."
I'd really like to just change the Y Axis Edit General Fixed End's value...?